So, I've been dipping my toe in the waters of Clojure UI development
using Gnome, and I immediately ran in into a problem making me regret my
years of Java apathy. I'm trying to write a toy program to processes
generic key presses made to the Gnome window and I'm stuck as to how to
translate the straight forward Java + Gnome interop into Clojure + Gnome
Interop. Here are the relevant pieces:
w = new Window();
l = new Label("<b>Start Typing!</b>\n" + "Start typing and details about\n"
+ "your KeyEvents will\n" + "appear on the console.");
l.setUseMarkup(true);
w.add(l);
w.connect(new Widget.KeyPressEvent() {
public boolean onKeyPressEvent(Widget source, EventKey event) {
final Keyval key;
final ModifierType mod;
key = event.getKeyval();
mod = event.getState();
System.out.print("Pressed: " + key.toString() + ", ");
System.out.print("Modifier: " + mod.toString() + " ");
if (mod == ModifierType.SHIFT_MASK) {
System.out.print("That's Shifty!");
}
if (mod.contains(ModifierType.ALT_MASK)) {
System.out.print("Hooray for Alt!");
}
if (mod.contains(ModifierType.SUPER_MASK)) {
System.out.print("You're Super!");
}
System.out.println();
return false;
}
});
And in Clojure:
...
(let [w (Window.)
...
(.connect w
(proxy [Widget$KeyPressEvent] []
(onKeyPressEvent [source event]
(println (str "I was clicked: " (.getLabel b)))
))
(proxy [Window$DeleteEvent] []
(onDeleteEvent [source event]
(Gtk/mainQuit) false)
(onDeleteEvents [source event]
(Gtk/mainQuit) false)
))
...
And here's what I'm trying to do with it:
(defn pushme []
(let [w (Window.)
v (VBox. false 3)
l (Label. "Go ahead:\nMake my day")
b (Button. "Press me!")]
(.connect b
(proxy [Button$Clicked] []
(onClicked [source]
(println (str "I was clicked: " (.getLabel b)))
(println (str "I was clicked: " source))
)))
(.connect w
(proxy [Widget$KeyPressEvent] []
(onKeyPressEvent [source event]
(println (str "I was clicked: " (.getLabel b)))
))
(proxy [Window$DeleteEvent] []
(onDeleteEvent [source event]
(Gtk/mainQuit) false)
(onDeleteEvents [source event]
(Gtk/mainQuit) false)
))
(.add v l)
(.add v b)
(.add w v)
(.setDefaultSize w 200 100)
(.setTitle w "Push Me")
(.showAll w)
(Gtk/main)
)
)
Results in:
Exception in thread "main" java.lang.RuntimeException:
java.lang.ClassNotFoundException: org.gnome.gtk.Window$KeyPressEvents
at clojure.lang.Util.runtimeException(Util.java:153)
at clojure.lang.Compiler.eval(Compiler.java:6417)
at clojure.lang.Compiler.eval(Compiler.java:6396)
at clojure.lang.Compiler.load(Compiler.java:6843)
at clojure.lang.Compiler.loadFile(Compiler.java:6804)
at clojure.main$load_script.invoke(main.clj:282)
at clojure.main$script_opt.invoke(main.clj:342)
at clojure.main$main.doInvoke(main.clj:426)
at clojure.lang.RestFn.invoke(RestFn.java:408)
at clojure.lang.Var.invoke(Var.java:401)
at clojure.lang.AFn.applyToHelper(AFn.java:161)
at clojure.lang.Var.applyTo(Var.java:518)
at clojure.main.main(main.java:37)
Caused by: java.lang.ClassNotFoundException:
org.gnome.gtk.Window$KeyPressEvents
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at
clojure.lang.DynamicClassLoader.findClass(DynamicClassLoader.java:61)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:186)
at user$eval21.invoke(main.clj:8)
at clojure.lang.Compiler.eval(Compiler.java:6406)
Any thoughts or suggestions would be appreciated.
Thanks!
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